Britain's Prince William visits the 'Horse to Hyperloop' exhibition during a visit to Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Britain's Prince William meets local school children during a visit to the 'Horse to Hyperloop' exhibition at the Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Britain's Prince William visits the 'Horse to Hyperloop' exhibition during a visit to Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Britain's Prince William visits the 'Horse to Hyperloop' exhibition during a visit to Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Britain's Prince William meets local school children during a visit to the 'Horse to Hyperloop' exhibition at the Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Britain's Prince William meets local school children during a visit to the 'Horse to Hyperloop' exhibition at the Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Britain's Prince William visits the 'Horse to Hyperloop' exhibition during a visit to Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Britain's Prince William meets local school children during a visit to the 'Horse to Hyperloop' exhibition at the Ryder Architecture Cooper's Studios, one of the centres that are hosting part of the Great Exhibition of the North, in Gateshead, Britain, September 7, 2018. REUTERS/Scott Heppell 

Darts - William Hill World Darts Championship - Alexandra Palace, London - 19/12/15
Laurence Ryder in action during the first round
Mandatory Credit: Action Images / Peter Cziborra
Livepic
EDITORIAL USE ONLY. 

Darts - William Hill World Darts Championship - Alexandra Palace, London - 19/12/15
Laurence Ryder in action during the first round
Mandatory Credit: Action Images / Peter Cziborra
Livepic
EDITORIAL USE ONLY. 

U.S. Ryder Cup player Tiger Woods (facing camera) hugs his caddie Steve Williams after Woods won his singles match against Francesco Molinari of Italy on the fourth day of the Ryder Cup at Celtic Manor in Newport, South Wales October 4, 2010. REUTERS/Kieran Doherty (BRITAIN - Tags: SPORT GOLF) 

U.S. Ryder Cup player Tiger Woods shelters under an umbrella held by his caddie Steve Williams on the fourth hole in heavy rain during four-ball play on the first day of the 2010 Ryder Cup at Celtic Manor in Newport, south Wales October 1, 2010 REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GOLF IMAGES OF THE DAY) 

U.S. Ryder Cup player Tiger Woods shelters under an umbrella as he walks off the course with his caddie Steve Williams on the fourth hole, after play is suspended on the first day of the 2010 Ryder Cup at Celtic Manor in Newport, south Wales October 1, 2010 REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GOLF) 

Greenkeepers clear water off the fairway as U.S. Ryder Cup player Tiger Woods walks off the course with his caddie Steve Williams on the fourth hole, after play is suspended on the first day of the 2010 Ryder Cup at Celtic Manor in Newport, south Wales, October 1, 2010 REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GOLF) 

U.S. Ryder Cup player Tiger Woods plays his second shot on the first hole watched by caddie Steve Williams during practice ahead of the 2010 Ryder Cup at Celtic Manor in Newport, south Wales September 28, 2010 REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GOLF) 

Fiji's William Ryder points at the sky after scoring a try against England in their semi-final at the international rugby sevens tournament in Wellington February 6, 2010. REUTERS/Anthony Phelps (NEW ZEALAND - Tags: SPORT RUGBY) 

New Zealand's Lote Raikabula (L) and Fiji's William Ryder (R) dive for the ball as Fiji push for a try during their semi-final match at the Emirates Airlines Dubai Rugby Sevens in Dubai December 5, 2009. REUTERS/Karl Jeffs (UNITED ARAB EMIRATES SPORT RUGBY) 

New Zealand's Lote Raikabula (2nd R) fights with Fiji's William Ryder (2nd L) and Emosi Vucago (R) during their semi-final match at the Emirates Airlines Dubai Rugby Sevens in Dubai December 5, 2009. REUTERS/Karl Jeffs (UNITED ARAB EMIRATES SPORT RUGBY) 

Fiji's William Ryder (R) fights with South Africa's Mzwandile Stick during their quarter-final match at the Emirates Airlines Dubai Rugby Sevens tournament December 5, 2009. REUTERS/Ahmed Jadallah (UNITED ARAB EMIRATES SPORT RUGBY) 

U.S. Ryder Cup team member Stewart Cink (L) plans his shot with his caddie, Frank Williams, on the seventh hole during foursome play in the 37th Ryder Cup Championship at the Valhalla Golf Club in Louisville, Kentucky September 19, 2008. REUTERS/Jeff Haynes (UNITED STATES) 

Fiji's William Ryder (C) struggles with Kenya's Dennis Mwanja (R) during the quarter-finals of the Hong Kong Sevens rugby tournament March 30, 2008. REUTERS/Bobby Yip (CHINA) 

Kenya's Humphrey Kayange (R) struggles with Fiji's William Ryder during the quarter-finals of the Hong Kong Sevens rugby tournament March 30, 2008. REUTERS/Bobby Yip (CHINA) 

Fiji's William Ryder's celebrates after scoring against Wales during the Hong Kong Sevens rugby tournament in Hong Kong March 29, 2008. REUTERS/Victor Fraile (CHINA) 

Fiji's William Ryder (R) is challenged by Zimbabwe's Gardner Nechironga during the preliminaries of the Hong Kong Sevens rugby tournament March 29, 2008. REUTERS/Bobby Yip (CHINA) 

Fiji's Waisale Serevi (R) comforts team mate William Ryder (L) after losing against Samoa in the Cup final of the Hong Kong Sevens rugby tournament in Hong Kong April 1, 2007. REUTERS/Bobby Yip (CHINA) 

Samoa's Lolo Lui (C) is tackled by Fiji's Emosi Vucago (L) and William Ryder during the Cup final of the Hong Kong Sevens rugby tournament in Hong Kong April 1, 2007. REUTERS/Bobby Yip (CHINA) 

Fiji's William Ryder (L) is tackled by Samoa's Lolo Lui during the Cup final of the Hong Kong Sevens rugby tournament in Hong Kong April 1, 2007. REUTERS/Bobby Yip (CHINA) 

New Zealand's Steven Yates (R) is tackled by Fiji's William Ryder during the Cup semi-final at the Hong Kong Sevens rugby tournament in Hong Kong April 1, 2007. REUTERS/Paul Yeung (CHINA) 

Scotland's Max Evans (L) reaches for the ball beside Fiji's William Ryder (C) and Scotland's Ross Rennie during their Cup quarter-final match at the Hong Kong Sevens rugby tournament in Hong Kong April 1, 2007. REUTERS/Bobby Yip (CHINA) 

Fiji's William Ryder (L) runs as Scotland's Mike Adamson tries to tackle him during the Cup quarter final at the Hong Kong Sevens rugby tournament in Hong Kong April 1, 2007. REUTERS/Paul Yeung (CHINA) 

Fiji's William Ryder (L) runs as Scotland's Jamie Hunter tries to tackle him during their match at the Hong Kong Sevens rugby tournament in Hong Kong March 31, 2007. REUTERS/Paul Yeung (CHINA) 

U.S. Ryder Cup players Tiger Woods (L), Jim Furyk (C) and Woods' caddy Steve Williams shelter from the rain as they walk off the 11th green during their fourball golf match at the Ryder Cup tournament at The K Club in County Kildare, Ireland, September 23, 2006. REUTERS/Brian Snyder (IRELAND) 

U.S. Ryder Cup player Tiger Woods (L) chats with his caddy Steve Williams on the 15th fairway during their fourball golf match at the Ryder Cup tournament at The K Club in County Kildare, Ireland, September 22, 2006. REUTERS/Brian Snyder (IRELAND) 

U.S. Ryder Cup players, led by Tiger Woods (front L) and his caddy Steve Williams, walk on the fourth fairway during a golf practice for the Ryder Cup at The K Club in County Kildare, Ireland, September 20, 2006. REUTERS/Kieran Doherty (IRELAND) 

U.S. Ryder Cup player Tiger Woods (L) chats with team captain Tom Lehman (R) and his caddy Steve Williams during a golf practice for the Ryder Cup at The K Club in County Kildare, Ireland, September 20, 2006. REUTERS/Brian Snyder (IRELAND) 

Andrew Vilk (L) of England tackles William Ryder (C) of Fiji as Dave Seymour (R) watches during the final of the Singapore Sevens rugby tournament April 9, 2006. Fiji beat England 40-19 to win the tournament. REUTERS/Nicky Loh 

William Ryder (R) of Fiji gets tackled by David Strettle of England during their Cup match at the Singapore Sevens rugby tournament April 9, 2006. REUTERS/Nicky Loh 

William Ryder of Fiji celebrates after winning the Singapore Sevens rugby tournament April 9, 2006. REUTERS/Nicky Loh 

William Ryder (L) of Fiji runs past Eric Ng of Singapore during their Singapore Sevens rugby tournament April 8, 2006. REUTERS/Nicky Loh 

Fiji's William Ryder reacts after England scored a last-minute try by captain Ben Gollings during the cup final of the Hong Kong Sevens rugby tournament April 2, 2006. England beat Fiji 26-24. REUTERS/Bobby Yip 

England's Mathew Tait (R) fights through a tackle attempt by Fiji's William Ryder while on his way to scoring a try during England's win in the cup finals rugby match at the 2006 IRB USA Sevens rugby tournament in Carson, California February 12, 2006. REUTERS/Danny Moloshok 

England's Mathew Tait (R) fights through a tackle attempt by Fiji's William Ryder while on his way to scoring a try during England's win in the cup finals rugby match at the 2006 IRB USA Sevens rugby tournament in Carson, California February 12, 2006. REUTERS/Danny Moloshok 

Fiji's William Ryder (L) scores a try in the tackle of South Africa's Stefan Basson in the final of the International sevens rugby union tournament in Wellington February 4, 2006. Fiji beat South Africa 27-22 in extra time. REUTERS/Anthony Phelps 

Fiji's William Ryder (bottom) scores a try in the tackle of South Africa's Stefan Basson in the final of the International sevens rugby tournament in Wellington February 4, 2006. Fiji beat South Africa 27-22 in extra time. REUTERS/Anthony Phelps 

Fiji's William Ryder (top) is hugged by Sireli Naqelevuki (bottom C) after beating South Africa 27-22 in extra time in the final of the International sevens rugby union tournament in Wellington February 4, 2006. REUTERS/Anthony Phelps 

Fiji's William Ryder (L) hugs team mate Vimaeli Tuidraki after beating South Africa 27-22 in extra time in the final of the International sevens rugby union tournament in Wellington February 4, 2006. REUTERS/Anthony Phelps 

Fiji's Jone Daunivucu, William Ryder and Waisale Serevi (front, L-R) celebrate their 27-22 win over South Africa in extra time in the final of the International sevens rugby union tournament in Wellington February 4, 2006. REUTERS/Anthony Phelps 

Fiji's William Ryder (C) beats [Canada]'s defence to score a try in a first round match at the International Sevens rugby tournament at the Westpac Stadium in Wellington February 3, 2006. 

Fiji's William Ryder (C) beats Canada's defence to score a try in a first round match at the International Sevens rugby tournament at the Westpac Stadium in Wellington February 3, 2006. REUTERS/Anthony Phelps 

Fiji's William Ryder (C) beats Canada's defence to score a try in a first round match at the International Sevens rugby tournament at the Westpac Stadium in Wellington February 3, 2006. REUTERS/Anthony Phelps 

Argentina's Ramivo del Busto (L) is tackled by Fiji's William Ryder during the finals of the IRB Sevens tournament in George, South Africa, December 10, 2005. Fiji won the match 21-19. REUTERS/Howard Burditt 

Fiji's William Ryder (L) avoids a tackle by England's Simon Amor (R) during their semi-final match in the IRB Sevens tournament in George, South Africa December 10, 2005. Fiji won the match 28-22 to go into the finals against Argentina. REUTERS/Howard Burditt 

England's Dan Luger (L) avoids a tackle by Fiji's William Ryder during their semi-finals match in the IRB Sevens tournament in George, South Africa, December 10, 2005. Fiji won the match 28-22 to go into the finals against Argentina. REUTERS/Howard Burditt 

Fiji's William Ryder (L) avoids a tackle by England's Simon Amor during their semi-final match in the IRB Sevens tournament in George, South Africa December 10, 2005. Fiji won the match 28-22 to go into the finals against Argentina. REUTERS/Howard Burditt 

Fiji's captain Waisale Serevi (R) celebrates with his son and team mate William Ryder (L) after Fiji beat New Zealand 29-19 to win the Rugby World Cup Sevens final in Hong Kong March 20, 2005. REUTERS/Kin Cheung KC/JJ 

U.S. Ryder Cup golfer Tiger Woods (2nd L) stands with his caddie Steve Williams (L) while teammate Phil Mickelson (R) stands with his caddie Jim McKay (2nd R) as they wait to hit their approach shot to the eighth green during their first round four-ball match against Europeans Colin Montgomerie and Padraig Harrington at the 35th Ryder Cup Matches in Bloomfield, Michigan, September 17, 2004. REUTERS/Mike Blake GMH/HB